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Short answer
NRC ADAMS (Agencywide Documents Access and Management System) is the official electronic recordkeeping and public document retrieval system of the U.S. Nuclear Regulatory Commission (NRC). Operating under 10 CFR 2.390 and NRC Management Directive 3.53, ADAMS provides researchers and facility operators with public access to regulatory filings, licensing dockets, inspection reports, and safety evaluations.
Definition and scope
Established as the centralized repository for the Nuclear Regulatory Commission, ADAMS functions as the institutional archive and primary distribution platform for unclassified agency records. Codified under NRC Management Directive 3.53 (NRC Records and Document Management Program), ADAMS replaced earlier paper registries and microfiche distribution services.
The scope of ADAMS encompasses formal records created or received by the NRC during its oversight of civilian nuclear materials and facilities under the Atomic Energy Act of 1954 and Title 10 of the Code of Federal Regulations. The system houses:
- Licensing Filings: Applications and amendments for commercial reactors (10 CFR Part 50 and Part 52), research reactors, and export/import permits.
- Safety Evaluations: Technical evaluations (SERs) prepared by NRC engineering staff assessing facility safety analyses.
- Inspection Reports: Baseline inspection reports, notices of violation, and licensee event reports (LERs).
- Regulatory Guidance: Federal Register notices, regulatory guides, and NUREG technical reports.
- Commission Decisions: Hearing transcripts and orders issued by the Atomic Safety and Licensing Board (ASLB).
As an official data repository satisfying National Archives and Records Administration (NARA Schedule DAA-0412-2013-0003) standards, ADAMS provides permanent open-access verification of federal regulatory actions.
How it works or how it is used in practice
In practice, ADAMS integrates two primary search interfaces, structured metadata profiling, and standardized identifier conventions that enable precise technical document retrieval.
Core Access Interfaces
- ADAMS Public Search (APS): The cloud-based search interface optimized for public access. APS supports rapid keyword indexing, faceted filtering by document type and author affiliation, and direct PDF downloads.
- Web-based ADAMS (WBA): The advanced search portal recommended by the National Organization of Test, Research and Training Reactors (TRTR) for multi-field queries. WBA enables relational searches across Docket Numbers, License Numbers, and accession ranges.
Accession Number Architecture
Every record entering ADAMS receives a permanent accession number prefixed by ML (Main Library):
ML + [2-digit year] + [3-digit Julian day] + [1-character sequence block] + [3-digit item number]
For example, accession number ML23124A053 (cited in Federal Register notice 91 FR 68991) indicates cataloging in 2023 on the 124th day (May 4), within block A, item 053. Multi-part submissions are linked into an ADAMS “Package” carrying its own package ML identifier.
Docket and Programmatic Filtering
Retrieval relies on structured metadata to bypass irrelevant full-text matches:
- Docket Numbers: Structured by regulatory class. Commercial reactors use five-digit dockets preceded by 050 (e.g., Docket 05000289). Non-power research reactors use Part 50 assignments. Materials licensees use Part 30 (030xxxxx), fuel facilities use Part 70 (070xxxxx), and export permits use Part 110 (110xxxxx).
- Document Date vs. Date Added: Researchers must distinguish the authoring date from the “Date Added” (release into ADAMS following review under Management Directive 3.4).
Sensitive documents are screened under protocols analogous to the Traffic Light Protocol to separate publicly releasable pages from restricted submittals.
Types or related concepts
The NRC document ecosystem comprises distinct historical and functional collections:
| Collection / Interface | Coverage Dates | Primary Format | Scope and Contents | Key Search Strategy |
|---|---|---|---|---|
| PARS Library (Public Records) | November 1, 1999 to Present | Searchable PDF | All official unclassified public agency records, filings, and correspondence. | Search by ML accession number or facility docket number in APS. |
| Legacy Library | 1954 to October 1999 | Bibliographic index | Historical regulatory records from the AEC and pre-ADAMS NRC eras. | Query citation index; order microfiche through the Public Document Room (PDR). |
| ADAMS Public Search (APS) | Modern active portal | Cloud web portal | Public discovery platform with full-text search, viewer, and direct export. | Use faceted filters for Document Type, Docket, and date ranges. |
| Non-Public ADAMS | All periods | Restricted repository | Proprietary data, safeguards, and deliberative records under 10 CFR 2.390. | Accessible only through formal declassification or FOIA review. |
Researchers investigating regulatory histories frequently correlate ADAMS releases with external archives such as the National Security Archive to track policy evolution.
Where it matters for labs, clinics or supply decisions
ADAMS serves as a practical compliance and benchmarking resource across several scientific and industrial sectors:
- University Research and Test Reactors: Academic research reactors operating under 10 CFR Part 50 rely on ADAMS to track operator licensing examination standards, safety analysis reports (SARs), and NRC generic letters, as outlined by the TRTR.
- Nuclear Medicine and Hospital Facilities: Clinical centers using diagnostic radioisotopes or teletherapy units consult ADAMS for Sealed Source and Device (SS&D) evaluations, medical event reporting trends, and delivery system safety notices.
- Supply Chain and Component Qualification: Laboratories testing nuclear-grade instrumentation or shielding review 10 CFR Part 21 defect notices and vendor inspection reports in ADAMS to detect counterfeit, fraudulent, or suspect items (CFSI).
- Public Document Room (PDR) Support: When records cannot be located online, researchers contact NRC PDR staff at 1-800-397-4209, 301-415-4737, or
[email protected]. The physical PDR at One White Flint North, 11555 Rockville Pike, Rockville, MD 20852, operates weekdays from 8:00 a.m. to 4:00 p.m. ET.
Common misunderstandings
- Misconception 1: “ADAMS contains full text back to 1954.” Full-text electronic PDFs are routinely available only for documents released since November 1, 1999. Older records (1954 to 1999) exist as bibliographic citations requiring microfiche reproduction via the PDR.
- Misconception 2: “Submissions appear instantly online.” Filings undergo sensitive-information screening under Management Directive 3.4, requiring a multi-day processing cycle before public release.
- Misconception 3: “Docket numbers and accession numbers are interchangeable.” A docket number designates an entire facility or proceeding (e.g., Docket 05000289), whereas an accession number (ML number) uniquely identifies a single document within that docket.
- Misconception 4: “Proprietary filings leave no trace in ADAMS.” Under 10 CFR 2.390, applicants must submit a redacted public version displaying redaction brackets alongside the withheld proprietary filing.
FAQ
What does the ML prefix stand for in an NRC ADAMS accession number?
The “ML” prefix stands for “Main Library.” It is the identifier prefix assigned by the NRC’s electronic document system to designate records residing in the primary public collection.
How do I search for a document in ADAMS if I only have a nuclear facility name?
In APS or WBA, enter the facility name into the “Text” field and narrow results by selecting the appropriate regulatory document type (e.g., Licensee Correspondence or Safety Evaluation), or look up the facility’s formal docket number.
What regulations govern the withholding of confidential records from ADAMS?
Withholding from public release is governed by 10 CFR § 2.390 (“Public inspections, exemptions, requests for withholding”). Specific exemptions protect trade secrets, proprietary commercial data, safeguards information, and personal privacy records.
Sources
- U.S. Nuclear Regulatory Commission: “ADAMS Public Documents.” Official reading room portal and repository access: https://www.nrc.gov/reading-rm/adams.html. Read date: 2026-11-11.
- U.S. Federal Register: Nuclear Regulatory Commission Notice 91 FR 68991 (November 2, 2026), “Perma-Fix Northwest Richland, Inc.; Export License Renewal Application” (Docket No. 11006380, NRC-2019-0213). Accession number standards and PDR contact details. Read date: 2026-11-11.
- Code of Federal Regulations: 10 CFR § 2.390, “Public inspections, exemptions, requests for withholding.” Available via Legal Information Institute: https://www.law.cornell.edu/cfr/text/10/2.390. Read date: 2026-11-11.
- National Organization of Test, Research and Training Reactors (TRTR): “Guide To Using NRC ADAMS Search”: https://www.trtr.org/guide-to-using-nrc-adams-search/. Read date: 2026-11-11.
- National Archives and Records Administration (NARA): Records Disposition Authority DAA-0412-2013-0003, Record Group 0412 (NRC Agencywide Documents Access and Management System): https://www.archives.gov/files/records-mgmt/rcs/schedules/independent-agencies/rg-0412/daa-0412-2013-0003_sf115.pdf. Read date: 2026-11-11.
